Me and my friend was feeling a little adventurous, so we took a bus+BTS(skytrain) for about 80Baht/person and 15 minutes walk. If you feel like saving money and try the local transportation, definitely do that.

Take a bus right outside the airport to the closest BTS station, you want to get to the Thon Buri station, its on Silom line(dark green).

The hostel is at the end of the alley with orange lights, easy to see at night. Staff is friendly and helpful, knows the area well.

Location is great, 10mins walk from the pier, you can get on a ferry across the river, and travel along the river whole day!

Recommend backpackers to stay here!